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CALORIMETRIC DETERMINATION OF ABSORBED DOSE AND GFe +++ OF THE FRICKE DOSIMETER WITH 10-Mev AND 20-Mev ELECTRONS

Journal Article · · Radiation Res.
DOI:https://doi.org/10.2307/3571372· OSTI ID:4156518
; ;
The construction and operation details of a local absorbed dose microcalorimeter are presented. This calorimeter measures the absorbed dose rate at any desired point within an irradiated medium. The measurement is specific to a sufficiently limited region (2.0 cm in dia, 0.3 cm deep) that the measurement is essentially at a point and no integration or averaging process is necessary to qualify either the absorbed dose, or its rate. The system is sufficiently sensitive to provide about 1% accuracy at dose rates of 50 rads/min. The application of this calorimeter to 10-Mev and 20-Mev incident electrons is described. The use of a secondary standard (Victoreen 25-r chamber) under specified conditions is given together with details of calibration for use with high-energy electrons. The influence of the polarization effect was noted. The Fricke ferrous sulfate dosirieter was also calibrated for these energies of electrons. Samples of dosimeter solution were exposed in a geometry identical with that of the small sensitive region of the calorimeter. A value of G/sub Fe// sup 3+/ of 15.32 plus or minus 0.34 was obtained for 10-Mev electrons, and a value of 15.17 plus or minus 0.28 for 20-Mev electrons. (auth)
Research Organization:
Sloan-Kettering Inst., New York
Sponsoring Organization:
USDOE
NSA Number:
NSA-18-002072
OSTI ID:
4156518
Report Number(s):
TID-19171
Journal Information:
Radiation Res., Journal Name: Radiation Res. Vol. Vol: 20
Country of Publication:
Country unknown/Code not available
Language:
English

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Related Subjects

ABSORPTION
CALORIMETERS
EFFICIENCY
ELECTRONS
ENERGY
GYROMAGNETIC RATIO
INSTRUMENTATION
IONIZATION CHAMBERS
IONS
IRON
IRON SULFATES
MAGNETIC MOMENTS
MEASURED VALUES
POLARIZATION
RADIATION DOSES
SAMPLING
SENSITIVITY
SPIN